ISD4004-08MS Equivalent & Substitute Parts

Part Overview

The ISD4004-08MS is a Voice Record/Playback IC from Nuvoton Technology Corporation's ChipCorder® series, designed for multiple message applications with 8 minutes of recording/playback duration. This interface component operates via SPI protocol and processes analog differential input signals with single-ended analog output. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component sourcing.

Substiute Parts

ISD4004-08MS

Nuvoton Technology CorporationIn Stock: 1432ISD4004-08MS Datasheet

Current PartRFQ

ISD4003-08MSY

Nuvoton Technology CorporationIn Stock: 1051ISD4003-08MSY Datasheet

DirectRFQ

ISD4004-08MSY

Nuvoton Technology CorporationIn Stock: 1658ISD4004-08MSY Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the ISD4004-08MS is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

• Manufacturer: Nuvoton Technology Corporation (same manufacturer ensures design compatibility)
• Series: ChipCorder® (maintains product line consistency)
• Interface: SPI (identical communication protocol)
• Input/Output Signal Types: Analog - Differential input, Analog - Single Ended output (signal processing architecture)
• Duration: 8 Min (recording/playback capacity)
• Messaging: Multiple (message handling capability)
• Package / Case: 28-SOIC (0.295", 7.50mm Width) (mechanical and electrical footprint compatibility)
• Voltage - Supply: 2.7 V ~ 3.3 V (power supply compatibility)
• Operating Temperature: 0°C ~ 70°C (TA) (thermal operating range)

Secondary Variation Parameters:

• Sampling Frequency: 8kHz (ISD4004 series) vs. 4kHz (ISD4003 series)
• Filter Pass Band: 3.4kHz (ISD4004 series) vs. 1.7kHz (ISD4003 series)
• Product Status: Obsolete vs. Active
• RoHS Compliance: RoHS non-compliant vs. ROHS3 Compliant

The ISD4004-08MSY is a direct equivalent with identical sampling frequency and filter pass band. The ISD4003-08MSY is a functional substitute with reduced sampling frequency and filter pass band specifications, suitable for applications where lower audio bandwidth is acceptable.

Parameter Comparison

Engineering Selection Recommendations

ISD4004-08MSY (Direct Equivalent): This part is the primary substitute for the obsolete ISD4004-08MS. It maintains identical electrical specifications including 8kHz sampling frequency and 3.4kHz filter pass band. The ISD4004-08MSY is currently in active production status and is ROHS3 compliant, providing regulatory advantage over the original part. Pin-for-pin and functional compatibility is complete. This part is suitable for direct replacement in existing designs without circuit modification.

ISD4003-08MSY (Functional Substitute): This part is a secondary substitute option when audio bandwidth reduction is acceptable for the application. The ISD4003-08MSY operates at 4kHz sampling frequency with a 1.7kHz filter pass band, resulting in narrower audio frequency response compared to the ISD4004 series. This part is also in active production and ROHS3 compliant. Selection of this part requires design review to confirm that reduced audio bandwidth meets application requirements. Package and interface compatibility remain identical to the main part.

Frequently Asked Questions (FAQ)

Q: Can ISD4004-08MSY be used as a direct replacement for ISD4004-08MS? A: Yes. The ISD4004-08MSY is electrically and functionally identical to the ISD4004-08MS. Both parts share the same sampling frequency (8kHz), filter pass band (3.4kHz), package (28-SOIC), and interface specifications (SPI). No circuit modifications are required.

Q: What is the difference between ISD4004-08MSY and ISD4003-08MSY? A: The primary difference is sampling frequency and filter pass band. ISD4004-08MSY operates at 8kHz with 3.4kHz filter pass band, while ISD4003-08MSY operates at 4kHz with 1.7kHz filter pass band. The ISD4003-08MSY provides reduced audio bandwidth suitable for applications where lower frequency response is acceptable.

Q: Are both substitute parts pin-compatible with the original ISD4004-08MS? A: Yes. Both ISD4004-08MSY and ISD4003-08MSY use the same 28-SOIC package with identical pin configuration and electrical interface (SPI). They are mechanically and electrically interchangeable at the package level.

Q: What is the advantage of using ISD4004-08MSY over the original ISD4004-08MS? A: The ISD4004-08MSY is in active production status and is ROHS3 compliant, whereas the original ISD4004-08MS is obsolete and RoHS non-compliant. For new designs and long-term component availability, ISD4004-08MSY is the recommended choice.

Q: Can ISD4003-08MSY be used in applications designed for ISD4004-08MS? A: ISD4003-08MSY can be used only if the application can tolerate reduced audio bandwidth (4kHz sampling frequency vs. 8kHz). Applications requiring full 8kHz sampling frequency and 3.4kHz filter pass band must use ISD4004-08MSY.

Q: What are the supply voltage requirements for all three parts? A: All three parts (ISD4004-08MS, ISD4004-08MSY, and ISD4003-08MSY) operate within the same supply voltage range of 2.7 V to 3.3 V. Power supply design compatibility is maintained across all parts.

Q: Are there any moisture sensitivity considerations for these parts? A: All three parts have Moisture Sensitivity Level (MSL) rating of 3 with 168 hours floor life. Standard moisture control procedures during storage and handling are required for all parts.